By Christos H. Papadimitriou (auth.), Ralf Hartmut Güting, Dimitris Papadias, Fred Lochovsky (eds.)
This ebook constitutes the refereed complaints of the sixth foreign Symposium on Spatial Databases, SSD'99, held in Hong Kong, China in July 1999.
The 17 revised complete papers provided have been conscientiously chosen from fifty five submissions. additionally incorporated are brief papers comparable to 3 invited talks and business purposes displays. The papers are prepared in chapters on multi-resolution and scale, indexing, relocating gadgets and spatio-temporal facts, spatial mining and class, spatial sign up for, uncertainty and geological hypermaps, and commercial and visionary program music.
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Additional resources for Advances in Spatial Databases: 6th International Symposium, SSD’99 Hong Kong, China, July 20—23, 1999 Proceedings
Relations co-CC1 and counter-CC1,2 are mutually exclusive: a k-simplex cannot have both a co-CC1 , and a counter-CC1,2 cell at the same (k − 1)-facet. The same property holds for relations co-CC2 and counter-CC2,1 . The above four relations do not capture all possible CC relations among cells in an SMC, but they are sufficient to support efficient reconstruction algorithms, as explained in the following. Relations CV and CC, defined in the context of a mesh extracted from an SMC by the algorithms described in Section 3, also characterize the winged data structure.
The area affected by each update is shaded. An SMC abstracts from the totally ordered sequence by encoding a partial order describing the mutual dependencies between pairs of updates. Updates forming any subset closed with respect to the partial order, when performed in a consistent sequence, generate a valid simplicial complex. Thus, it is possible to perform more updates in some areas, and fewer updates elsewhere, hence obtaining a complex whose resolution is variable in space. Such an operation is known as selective refinement, and it is at the basis of LOD management.
Another subtle issue, which affects the performance of the extraction algorithms, is the lack of information on the update that must be applied to refine the mesh at a given cell. This is due to the fact that cells are associated with nodes, rather than with arcs. When sweeping the current front after a node U , the state of the current mesh, and the update information stored in U , allow us to determine which cells are removed, and which cells are created by U . All new cells are tagged with U as their creator.